I second what liviam said, house work and everything else can wait its not worth the stress also something easy like toasted sandwiches for tea isnt going to hurt just to make it easier on your self. I have only had both kids sick once so far although DD wasnt to bad just whingy and sooky, i just put on some movies for her so she could rest without running around like a mad woman to help her recover quicker. With DS he was happy enough to just sit and play with me and DD on the floor until he was hungry or tired.
Definately get some OJ just make sure its real OJ as this will work the best. Also some honey and lemon is good i give this to DD in some warm water and it helps to soothe her.
With the sleep thing if they arnt sleeping well at night i just chucked them in with me, means i didnt get much sleep but at least they were to help them get better

Hope they are feeling better soon and dont pass it one to you